Maybe because Chinese aren't the only people that carried the virus to America.
It is factual we lowered seed infections by stopping travel from china. There population was in more advanced stages because it originated there.
Of course other seed infections traveled here from all.over thenworld but at a lower potential infection rate
This is so easy to understand I'm not sure what's taking you so long.
The main reason the US is not italy right now aside from the aged population is we stopped travel from.china.